add match and contains token

Author: waderwu

src/main/grammars/datalog.bnf

@@ -77,6 +77,9 @@
     MAX="min"
     SUM="sum"
 
+    CONTAINS = "contains"
+    MATCH = "match"
+
     IDENTIFIER = 'regexp:[_?a-zA-Z][_?a-zA-Z0-9]+|[?a-zA-Z]'
 
     LESS_COLON='<:'

src/main/grammars/datalog.flex

@@ -102,6 +102,8 @@ MACRO_CONTINUATION = \\[ \t\f]*{LINE_BREAK}
   "max"                 { return MAX; }
   "min"                 { return MIN; }
   "sum"                 { return SUM; }
+  "match"               { return MATCH; }
+  "contains"            { return CONTAINS; }
 
   "lnot"                { return LNOT; }
   "lor"                 { return LOR; }

src/main/kotlin/com/lfrobeen/datalog/lang/completion/DatalogKeywordCompletionContributor.kt

@@ -33,6 +33,8 @@ class DatalogKeywordCompletionContributor : CompletionContributor() {
                 "#endif",
                 "#define",
                 "#pragma",
+                "match",
+                "contains",
             )
         )
     }